Improvement in fire-proof shutters



S. B. MUNSON,l 1r.

\mprovement in Fire-Proof Shutters.

No. A1321583.

Patented ocr. 29,1612.

W'znes es,

' UNITED STATES PATENT OFFICE.

SAMUEL B. MUNSON, JR., OF CHICAGO, ILLINOIS.

IMPROVEMENT IN FIRE-PROOF SHUTTERS.

Specification forming part of Letters Patent No. 132,683, dated October29, 1872.

To all 'whom it may concern.

Be it known that I, S. B. MUNSON, Jr., of Chicago, in the county of Cookand in the State of Illinois, have invented certain new and usefulImprovements in Metal Shutters for Doors or Windows; and do herebydeclare that the following is a full, clear, and exact descriptionthereof, reference being had to the accompanying drawing making a partof this specification, in which- Figure 1 is a perspective View of ashutter constructed in accordance with my improved method; Fig. 2 is anenlarged end view of they same and Fig. 3 is a like View of said devicewith the side plates arranged so as to change the relative positions ofthe corrugations.

Letters of like name and kind refer to like parts in each of the igures.

My invention is an improvement in a class of metal shutters used forinclosing the windows of buildings and for affording exterior protectiontothe same against fire; and it consists in a shutter composed of twoplates of corrugated iron combined with a central frame in such a manneras to form a series of vertical passages through which air may freelycirculate, substantially as and for the purpose hereinafter specified.

In the annexed drawing, A and A represent two plates of sheet metal,corrugated transversely except at their sides where is left upon each aplane strip, a, that is in a line with the inner face of the plate, orrather with the prominent portions of its corrugations. A frame, B,formed of or from a plain sheet of metal that corresponds in'size andexterior shape to the plates A, is placed between the same, 1nd thewhole firmly secured together by means of a line of rivets, b, whichpass through said parts just within their edges. If desired, the centerof the plate B may be cut away just within its edge so as to leave arectangular frame; in which event one or more central cross-bars, C,maybe placed between the plates A at suitable 4points between theirupper and lower ends, and a row of rivets, b, passed through said parts.The plates A are preferably placed so as to bring their corrugationsopposite to each other, as seen in Figs. l and 2, but, if desired, saidcorrugations may be arranged in parallel lines, as seen in Fig. 3.

As thus constructed, it will be seen to be a distinctive feature thatthe corrugated plates forni a series of passages, open at their upper'and lower ends, through which air may freely circulate, by which meansthe interior space between said plates is kept at a much lowertemperature than would be possible if the same were tightly inclosed andfilled with deadair 7 only.

Having thus fully set forth the nature and merits of my invention, whatI claim as new, 1s-

A window or door shutter, composed of corrugated plates combinedtogether to form a series of vertical airpassages open at each end,substantially as and for the purpose speciiied.

In testimony that I claim the foregoing I have hereunto set my hand this14th day of September, 1872.

SAMUEL B. MUNSON, JR.

Witnesses:

PLATTE BURR, Normrs G. NORTH. f

